Plan for implementing battlescripting

Battlescripting is a feature that users have been asking for ever since the introduction of Plotscripting

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clean up script code sufficiently to make scripts executable in battle through the same interpreter.
- organize script command implementations into plot-only, battle-only, and universal
- make sure that battle script can be safely isolated from running plotscripts
clean up battle code sufficiently that we can create sane scripting interfaces to it
- very important NOT to add lazy hack interfaces to un-cleaned-up battle code (more future backcompat nightmares)
Re-implement existing attack/attacker implementations in plotscripting